This is why I always think it's best to wait for NPD rather than the guess work of vgchartz or relying on Sony PR.
Dont actually think the sold through numbers are that far off TBH, the 1.2 million PS3 is from black friday (23rd November) till end off December. So with the approx 320K from the 2 weeks in Novembers it would only leave approx 100K in the channels and in stores. Not sure but i think North America also includes Canada sales whereas these NPD are US only, Canada's come out a few days later.
THe VGchartz are not to far off iff you look at what they said and the NPD's
NPD USA Est. NPD Total Vgchartz VGC/NPD Est
DS 2,470,000 2,650,310 2,876,040 1.08
Wii 1,350,000 1,453,950 1,638,849 1.13
360 1,260,000 1,349,460 1,289,156 0.96
PS2 1,100,000 1,162,700 951,764 0.82
PSP 1,060,000 1,118,300 960,885 0.86
PS3 797,600 876,562 774,795 0.88
So they was only 15% out Max, not bad for a free service, also dont forget NPD are still estimates and do not include sales figures from several big US stores and prob the biggest worldwide online store, so NPDs are still estimates. I would always rely on the Company statements rather NPD as they are far more reliable, and they cannot just make up numbers as these numbers will effect stock prices, company strategy etc , NPDs are still very good guesses not total fact.
I guessed the Wii is still suffering from supply shortages, as i expected to see a lot more Wii sales in the US than that, even though its still High.
The 360 had good hardware Sales and great Software sales, pretty much the market leader in the US.
Shame that only the US release Data like this as the story in Japan and the EU / other regions is quite different.
Think that 2008 will be even bigger regarding sales of consoles and software, but probably not as big as leap as from 2006-2007.